JPS63114648A - Squeegee pressure calibration device - Google Patents

Abstract

PURPOSE:To indicate an amount of strain on an indicator in a strain measurement device so that it can be adjusted while being measured, by a method wherein a film-form strain gage detecting pressure is held between a printing mount and a squeegee and the output value of the film-form strain gage is measured. CONSTITUTION:A squeegee pressure measurement circuit measures the value of resistance of a resistance wire R1 of a strain gate 30A to indicate the resulting value as a pressure value. The resistance wire R1 (the strain gage 30A) is connected to resistance wires R1-R4 on the side of the measurement circuit through a Wheatstone bridge circuit, in which a voltage V1 is applied across terminals (b) and (d) from a constant-voltage power supply in a strain measurement device 10 and an amplifier 15A is connected between terminals (e) and (g). In this construction, the application of pressure to the strain gage 30A changes the value of resistance of the resistance wire R1, thus changing the balance condition of the bridge circuit and, thereby, generating a variable voltage V2. This variable voltage V2 is amplified by the amplifier 15A and inputted to an indicator 13A to be indicated as the value of resistance of the strain gage 30A.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a squeegee pressure calibration mount most suitable for use in adjusting squeegee pressure in screen printing.

(Technical background of the invention and its problems) Conventionally, in screen printing, a squeegee is applied to the inner surface of a screen plate, maintained at a certain angle (45° to 70°) to the plate surface, and slid while applying pressure. , the ink contained in the screen frame passes through the holes of the screen and is printed on the printing material surface.

However, in order to obtain uniform prints with this type of screen printing, it is necessary to adjust the height and pressure of the squeegee before printing, and in the past, these tasks were performed by experienced workers by intuition. However, adjustment was not uniform due to individual differences among workers.

(Object of the invention) This invention was made under the above circumstances,
The purpose of this invention is to detect squeegee pressure with a strain gauge that is a pressure detector, display the amount of strain on a display of a strain rate measuring device,
r! III. It is an object of the present invention to provide a squeegee indenter calibration device which can be adjusted while being fixed.

(Summary of the Invention) The present invention relates to a squeegee pressure calibration device, and in screen printing in which a squeegee is used to print on printing paper stored on a printing table, a film strain gauge for detecting pressure is connected to the printing table and the printing table. The strain gauge is sandwiched between the squeegee and the squeegee pressure is adjusted by measuring the output value of the film strain gauge.

(Embodiment of the Invention) FIG. 1 shows the external configuration of a squeegee pressure calibration device which is an embodiment of the present invention. The squeegee pressure is detected by the strain detector 100 and the squeegee pressure is adjusted while measuring the output voltage by the strain measuring device 10.

The strain detector 100 has a structure in which film-shaped strain gauges 30A, 30B, and 30G are adhered to a rectangular thin sheet member 20, and a squeegee 50 placed on the strain gauges 30A to 30C. The pressure of the rubber portion 51 at the tip (squeegee pressure) is detected. Further, the strain gauges 308 to 30C are provided with codes 358 to 35G, and the output voltages are inputted to the strain rate measuring device IO by the codes 35A to 35G. The strain rate measuring instrument 10 is provided with a connector 12 on the lower right side of the front, cords 358-35G for strain gauges 30A-30G are connected to this connector 12, and a power switch is connected above the connector 12. 1
] is provided. Indicators (here, meters) 13A-13 (:) are provided at the upper front part of the strain rate measuring instrument 10, and the pressures applied to the strain gauges 30A to 30G are displayed. Below the indicators 13A to 13C is provided with zero point adjustment volumes 148 to 14C, and displays 13A to 13G.
It is designed to perform zero point correction.

FIG. 2 shows the circuit configuration of the squeegee pressure calibration device. Here, the squeegee pressure measurement circuit using strain gauge 308 will be explained, but other strain gauges 30B,
The 30G measurement circuit also has a similar configuration.

In addition, an example in which a resistance wire strain gauge is used for the strain gauge 3 (IA) will be described here.

The strain gauge 30A is a resistance line that indicates a resistance value corresponding to strain caused by pressure. The squeegee pressure measuring circuit of this embodiment measures the resistance value of the resistance line R1 of the strain gauge 30A and displays the result as a pressure value. Resistance wire R on the circuit side
1-R4 are connected by a Wheatstone bridge circuit, and this is the terminal of the Wheatstone bridge circuit.

6, a voltage 1 is applied from the constant voltage power supply 16 in the distortion factor measuring device 10.
/l is applied, an amplifier 158 is connected between terminals e and 3, and when pressure is applied to the strain gauge 30A and the resistance value of the resistance wire R1 changes, the balance condition of the bridge circuit changes and the voltage changes. V2 is generated, and this changing voltage v2 is amplified by the amplifier 15A, inputted to the display 3A, and displayed as the pressure value of the strain gauge 30A. Amplifier 15A has zero point adjustment volume 1
4A is connected, and the zero point of the display 13A is adjusted by changing the offset value of the amplifier 15A.

Furthermore, the above squeegee pressure measurement circuit is not limited to the Wheatstone bridge circuit, but can be applied to other bridge circuits,
Alternatively, a voltage drop method, a potentiometer method, or the like may be used.

FIG. 3 shows the relationship between the strain detector ion and the squeegee 50. In the figure, the strain detector 100 is placed on the printing table 40 of a screen printing machine, and the squeegee 50 is placed on the strain detector 100. It shows how it is placed. squeegee 5
Pressures Fl and F2 are applied to the upper part of the squeegee 50, and pressures T1 to T3 are applied to the strain gauges 308 to 30C of the strain detector 100 from the rubber part 51 of the squeegee 50. Therefore, as shown in the figure, the pressures F1 and F at the top of the squeegee 50 are
2 to make the pressures Tl to T3 applied to the strain gauges 30A to 30C as T-Tl・T2-T3,
It can be seen that the squeegee pressure applied to the strain detector 100 becomes uniform. Therefore, if a printing paper is inserted instead of the distortion detector 100 after adjustment, the same result will be obtained.

FIG. 4 shows an example in which the squeegee pressure calibration device is mounted on a screen printing machine. Here, the squeegee 50 is attached to the screen printing machine, and a strain detector 100 is inserted between the squeegee 50 and the printing table 40. . The squeegee 50 is fixed by a squeegee fixing member 42 of the screen printing machine, and squeegee height adjustment knobs 43A and 43B are provided on the left and right sides of the squeegee fixing member 42.
It is designed to adjust the squeegee pressure on the left and right sides of 0. Furthermore, the squeegee fixing member 42 has a squeegee adjustment knob (
(not shown) is provided to adjust the squeegee pressure so that squeegee pressure is evenly applied to the entire squeegee 50.

In such a configuration, a method of using the squeegee pressure calibration device will be described.

First, an operator connects the connector 12 to the strain rate measuring device IO, places the strain detector 100 on a separately prepared stand, etc., and turns on the power switch 11 of the strain rate measuring device 10. and,
Apply the optimum pressure (for example, lO to g/cm
2), the pressure will be displayed on the displays 13A to 13G of the strain rate measuring device 10 as explained in FIG. 2, so adjust the zero point adjustment volumes 14A to 14C to display the pressure at this time. The value is 0. This makes it so that when the pressure is less, it becomes negative (-), and when the pressure is more than this, it becomes positive (+). Next, the strain detector 100 is inserted between the squeegee 50 and the printing table 40 of the screen printing machine, the squeegee is placed in the printing state (pressure is applied to the squeegee), and the squeegee height adjustment knobs 43A and 43B are adjusted to display the Vessel 13A
When the display value of ~13C is adjusted to O, the pressure applied to the left and right sides of the strain detector 100 becomes uniform as explained in FIG. 3, and the squeegee is adjusted to the optimum pressure for printing. Then, the screen printing machine is brought to a printing completion state, and the strain detector 100 is removed.

By making the above adjustments, the desired squeegee pressure can be obtained.
When the screen printing machine is put into printing mode, the printing paper is set, and printing is started, good printed matter can be obtained immediately.

(Effects of the Invention) According to the squeegee pressure calibration device of the present invention, since the squeegee pressure can be adjusted while being measured by the display, there is no individual difference among operators, and anyone can easily and quickly adjust the pressure. This has the effect that it is possible to adjust the squeegee pressure.

[Brief explanation of the drawing]

FIG. 1 is a front view of a squeegee pressure calibration device which is an embodiment of the present invention, FIG. 2 is a circuit diagram thereof, FIG. 3 is a diagram showing the relationship between the squeegee and the strain detector, and FIG. 4 is a diagram showing the relationship between the squeegee and the strain detector. It is a figure showing an example of implementation of a squeegee pressure calibration device. 10... Distortion measuring instrument, 11... Power switch, 12.
...Connector, 13A~13C...Display, 148~
14c... 7-point adjustment volume, 20... Sheet member, 30A to 30G... Strain gauge, 50... Squeegee, 100... Strain detector. Applicant's agent Yuzo Yasugata/: 3C13B f: 3A No. 3 No. 4

Claims (1)

[Claims] In screen printing in which printing is performed using a squeegee on printing paper placed on a printing table, a film strain gauge for detecting pressure is sandwiched between the printing table and the squeegee, and the film strain gauge is A squeegee pressure calibration device characterized in that the squeegee pressure is adjusted by measuring an output value.